If theyre a classII, theyve been using the electromagnetic spectrum far longer than us (maybe thousands of years longer). So , if they are for real and this hypothesis is even worth considering, we should have been getting "I LOVE LUCY" for many centuries, no?
Not exactly. If what we are seeing of them now is a Class II, then that's what they were 1500 years ago. Also, we don't know how long it takes for a civilization to get from Class I to Class II. It might be hundreds of years or it might be millions.
What matters though is what we see now because those are the EM Waves which are arriving at Earth today. So if we're seeing a Class II Civ, then we would also expect to be receiving Class II Civ level signals. That of course assumes that a Class II Civ even uses EM as a communications system any more. And even if they do, I'm not sure if we would be able to make any sense of it. It might be some type of dimensionally folded quantum packet stream or something and we wouldn't even have a theory to translate it, much less the technology to handle it. On the other hand, we might get lucky and maybe they're dumbing it down with the intention of spreading info to any listeners. Who knows.
The other possibility is that the variances in the star itself are some form of communication. That's really the biggest type of beacon you could construct that Class I's might be able to recognize.
One article I read said that we should be excited about this discovery, not because it might be aliens, but just because it's the weirdest damn thing astronomers have ever seen.